Re: comments on Performance Counters for Linux (PCL)

From: Peter Zijlstra
Date: Thu May 28 2009 - 12:48:01 EST

On Thu, 2009-05-28 at 18:25 +0200, Peter Zijlstra wrote:
> > - uint64_t exclude_*
> >
> > It seems those fields were added to support the generic HW events. But
> > I think they are confusing and their semantic is not quite clear.
> >
> > Furthermore, aren't they irrelevant for the SW events?
> They are.

It seems I can't read. They are _not_ irrelevant, sw events do honour
them. We can for instance distinguish between the kernel causing a
pagefualt and userspace doing so.

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